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About San Juan County
San Juan County is a county in the southeastern portion of the U.S. state of Utah. As of the 2020 United States census, the population was 14,518. Its county seat is Monticello, while its most populous city is Blanding. The Utah State Legislature named the county for the San Juan River, itself named by Spanish explorers. San Juan County borders Arizona, Colorado, and New Mexico at the Four Corners.
Description adapted from Wikipedia, CC BY-SA 4.0.
San Juan County at a glance
- County seat
- Monticello
- Population
- 14,518 (2020)
- Land area
- 7,933 sq mi
- Founded
- 1880
Largest communities in San Juan County
- Blanding3,394
- Monticello County seat1,824
- Oljato–Monument Valley682
- Spanish Valley529
- Navajo Mountain450
History of San Juan County
The Utah Territory authorized the creation of San Juan County on February 17, 1880, with territories annexed from Iron, Kane, and Piute counties. There has been no change in its boundaries since its creation. Monticello was founded in 1887, and by 1895 it was large enough to be designated the seat of San Juan County. On September 13, 2025, two extreme-level tornadoes touched down in the county. One was an EFU, the other was a strong EF2.
Adapted from Wikipedia, CC BY-SA 4.0.
Confirm you're ready to vote in San Juan County
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STEP 01
Run a guided check
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STEP 02
Ask San Juan County directly
Your county election office handles registration, mail ballots, and polling places.
San Juan County election resources
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Part of Utah Voter Check
This is the San Juan County page of Utah Voter Check, a project of True the Vote, pointing Utah voters at the official tools that already exist — and at Scan Check Protect to verify your registration.
Where anything here differs from what San Juan County or the Utah Lieutenant Governor's Office publishes, they are right and this page is not.